Inflatable tube
CA 1115036 A · Owner: Dunlop Limited · Inventors: Bimpson, Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to inflatable tubes such as buoyancy tubes for inflatable lifeafts and is aimed to provide tubes with bends in them that can be formed with a considerable reduction in the number of cutting and joining operation conventionally required and with a corresponding reduction in numbers of seams and hence sources of leakage. The invention provides a method of making such tube by overlapping and joining the longitudinal edges (231) of a suitable sheet material (230) to make a flattened tube (230A), marking on said tube a fold line (234) corresponding to the desired bend position, marking corresponding area (237A, 237B) one on each side of the fold line folding, about the fold …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.